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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19cce5f034748a51a7a2f5c43284e632cdc4d333e61a3a6e34d1d944f2f2058' 
  AND token = 'h+Z8u1HlPr4QUNoTPoWUlw4svsOtHPNbEgyWUsMWxpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}